wl-500gPv1 - high throughput fw recomandations

Hi,
I have an old wl-500gPv1 and want to use it as my main gateway (for some personal reasons)
I just need the best firmware with the highest throughput available (for 100/100 mbps WAN pppoe)
I've tested wl500g.googlecode fw and I only got 70mbps.
I don't mind if it's k2.4 or k2.6.
I don't need QoS or any special features (latest IPv6 - dhcpv6 from my ISP would be nice - but optional).
Botton line is - highest possible throughput - less features.
Thanks